Because of the good thermal stability and superior carrier transport characteristics of formamidinium lead trihalide perovskite HC(NH2)2PbX3 (FAPbX3), it has been considered to be a better optoelectronic material than conventional CH3NH3PbX3 (MAPbX3). Herein, we fabricated a FAPbBr3 microcrystal-based photodetector that exhibited a good responsivity of 4000 A W−1 and external quantum efficiency up to 106% under one-photon excitation, corresponding to the detectivity greater than 1014 Jones. The responsivity is two orders of magnitude higher than that of previously reported formamidinium perovskite... (More)

Because of the good thermal stability and superior carrier transport characteristics of formamidinium lead trihalide perovskite HC(NH2)2PbX3 (FAPbX3), it has been considered to be a better optoelectronic material than conventional CH3NH3PbX3 (MAPbX3). Herein, we fabricated a FAPbBr3 microcrystal-based photodetector that exhibited a good responsivity of 4000 A W−1 and external quantum efficiency up to 106% under one-photon excitation, corresponding to the detectivity greater than 1014 Jones. The responsivity is two orders of magnitude higher than that of previously reported formamidinium perovskite photodetectors. Furthermore, the FAPbBr3 photodetector’s responsivity to two-photon absorption with an 800-nm excitation source can reach 0.07 A W−1, which is four orders of magnitude higher than that of its MAPbBr3 counterparts. The response time of this photodetector is less than 1 ms. This study provides solid evidence that FAPbBr3 can be an excellent candidate for highly sensitive and fast photodetectors.[Figure not available: see fulltext.].

@article{a8528fe5-627d-45da-895e-a2e0820f36ea,
abstract = {<p>Because of the good thermal stability and superior carrier transport characteristics of formamidinium lead trihalide perovskite HC(NH<sub>2</sub>)<sub>2</sub>PbX<sub>3</sub> (FAPbX<sub>3</sub>), it has been considered to be a better optoelectronic material than conventional CH<sub>3</sub>NH<sub>3</sub>PbX<sub>3</sub> (MAPbX<sub>3</sub>). Herein, we fabricated a FAPbBr<sub>3</sub> microcrystal-based photodetector that exhibited a good responsivity of 4000 A W<sup>−1</sup> and external quantum efficiency up to 10<sup>6</sup>% under one-photon excitation, corresponding to the detectivity greater than 10<sup>14</sup> Jones. The responsivity is two orders of magnitude higher than that of previously reported formamidinium perovskite photodetectors. Furthermore, the FAPbBr<sub>3</sub> photodetector’s responsivity to two-photon absorption with an 800-nm excitation source can reach 0.07 A W<sup>−1</sup>, which is four orders of magnitude higher than that of its MAPbBr<sub>3</sub> counterparts. The response time of this photodetector is less than 1 ms. This study provides solid evidence that FAPbBr<sub>3</sub> can be an excellent candidate for highly sensitive and fast photodetectors.[Figure not available: see fulltext.].</p>},
articleno = {43},
author = {Zhang, Fengying and Yang, Bin and Zheng, Kaibo and Yang, Songqiu and Li, Yajuan and Deng, Weiqiao and He, Rongxing},
keyword = {External quantum efficiency,Formamidinium lead trihalide (FAPbBr),Perovskite microcrystals,Photodetector},
language = {eng},
month = {09},
number = {3},
publisher = {Springer},
series = {Nano-Micro Letters},
title = {Formamidinium Lead Bromide (FAPbBr<sub>3</sub>) Perovskite Microcrystals for Sensitive and Fast Photodetectors},
url = {http://dx.doi.org/10.1007/s40820-018-0196-2},
volume = {10},
year = {2018},
}